How do I fix error code C-21 on a Samsung ovens & ranges?

1. undefined: Disconnect power and measure oven sensor resistance (normal: 1080Ω at room temperature) 2. undefined: Check resistance of broil, bake, and convection heaters 3. undefined: Check if DLB, broil, bake, and convection relays are working normally 4. undefined: Check wire harness on Main PCB for disconnection 5. undefined: Check oven sensor connector resistance (normal: 2850Ω) 6. undefined: Unit displays C-21 after 10 beeps if temperature exceeds specification during operation

Samsung Ovens & Ranges2017–present

Error Code C-21

Oven sensor short circuit or abnormally high internal temperature

Moderate

Address soon - your appliance may not work properly

What This Means

Temperature sensor short circuited; Broil, bake, or convection heater resistance incorrect; Relay not working normally; Wire harness disconnected; Oven sensor connector open

How to Fix

1
Disconnect power and measure oven sensor resistance (normal: 1080Ω at room temperature)
2
Check resistance of broil, bake, and convection heaters
3
Check if DLB, broil, bake, and convection relays are working normally
4
Check wire harness on Main PCB for disconnection
5
Check oven sensor connector resistance (normal: 2850Ω)
6
Unit displays C-21 after 10 beeps if temperature exceeds specification during operation

This Error Applies To

Samsung NV51K6650D Series Ovens & Ranges (2017) (2017–present)

Service manual exact match: NV51K7770SService manual exact match: NQ70M6650D*Service manual exact match: NV51K6650D*Service manual exact match: NV51K6650DService manual exact match: NQ70M6650DSService manual exact match: NV51K6650DSService manual exact match: NV51K7770DGService manual exact match: NV51K7770SG